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I came up with - (1+sin(x+y))/(sin(x+y)) but it doesn't really seem right? If you can help, please do. :)
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i hope i am not doing any mistake...
if this is right, fan me plz.
You probably used implicit differentiation heist.
If you did, then you'd get your answer (and I got the same thing).
You could also check it here.
eDadou, I'm not sure why your method doesn't give the same answer.
I think it might have to do with taking the arccosine of both sides,
since that then restricts the domain over which x can vary.